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1 PhscsAndMathsTutor.com
2 phscsandmathstutor.com June A scentst found that the tme taken, M mnutes, to carr out an eperment can be modelled b a normal random varable wth mean 155 mnutes and standard devaton 3.5 mnutes. Fnd (a) P(M > 160). (b) P(150 M 157). (c) the value of m, to 1 decmal place, such that P(M m) = (4) (4) 16 *N20910A01620*
3 phscsandmathstutor.com June From eperence a hgh-jumper knows that he can clear a heght of at least 1.78 m once n 5 attempts. He also knows that he can clear a heght of at least 1.65 m on 7 out of 10 attempts. Assumng that the heghts the hgh-jumper can reach follow a Normal dstrbuton, (a) draw a sketch to llustrate the above nformaton, (b) fnd, to 3 decmal places, the mean and the standard devaton of the heghts the hgh-jumper can reach, (6) (c) calculate the probablt that he can jump at least 1.74 m. 14 *N22337A01420*
4 phscsandmathstutor.com June 2006 Queston 5 contnued *N22337A01520* 15 Turn over
5 phscsandmathstutor.com Januar The measure of ntellgence, IQ, of a group of students s assumed to be Normall dstrbuted wth mean 100 and standard devaton 15. (a) Fnd the probablt that a student selected at random has an IQ less than 91. (4) The probablt that a randoml selected student has an IQ of at least k s (b) Fnd, to the nearest nteger, the value of k. (6) 18 *N23957A01820*
6 phscsandmathstutor.com Januar 2007 Queston 7 contnued Q7 (Total 10 marks) TOTAL FOR PAPER: 75 MARKS END *N23957A01920* 19
7 phscsandmathstutor.com June The random varable X has a normal dstrbuton wth mean 20 and standard devaton 4. (a) Fnd P(X > 25). (b) Fnd the value of d such that P(20 < X < d) = (4) 18 *N26118A01824*
8 phscsandmathstutor.com Januar The weghts of bags of popcorn are normall dstrbuted wth mean of 200 g and 60% of all bags weghng between 190 g and 210 g. (a) Wrte down the medan weght of the bags of popcorn. (b) Fnd the standard devaton of the weghts of the bags of popcorn. (1) (5) A shopkeeper fnds that customers wll complan f ther bag of popcorn weghs less than 180 g. (c) Fnd the probablt that a customer wll complan. 20 *M29283A02024*
9 phscsandmathstutor.com Januar 2008 Queston 6 contnued Q6 (Total 9 marks) *M29283A02124* 21 Turn over
10 phscsandmathstutor.com June A packng plant flls bags wth cement. The weght X kg of a bag of cement can be modelled b a normal dstrbuton wth mean 50 kg and standard devaton 2 kg. (a) Fnd P(X >53). (b) Fnd the weght that s eceeded b 99% of the bags. (5) Three bags are selected at random. (c) Fnd the probablt that two wegh more than 53 kg and one weghs less than 53 kg. (4) 24 *H32582A02428*
11 phscsandmathstutor.com June 2008 Queston 7 contnued (Total 12 marks) TOTAL FOR PAPER: 75 MARKS END *H32582A02728* Q7 27
12 phscsandmathstutor.com Januar The random varable X has a normal dstrbuton wth mean 30 and standard devaton 5. (a) Fnd P(X < 39). (b) Fnd the value of d such that P(X < d) = (c) Fnd the value of e such that P(X > e) = (d) Fnd P(d < X < e). (2) (4) (2) (2) 22 *N32680A02224*
13 phscsandmathstutor.com Januar 2009 Queston 6 contnued (Total 10 marks) TOTAL FOR PAPER: 75 MARKS END Q6 24 *N32680A02424*
14 phscsandmathstutor.com June The lfetmes of bulbs used n a lamp are normall dstrbuted. A compan X sells bulbs wth a mean lfetme of 850 hours and a standard devaton of 50 hours. (a) Fnd the probablt of a bulb, from compan X, havng a lfetme of less than 830 hours. (b) In a bo of 500 bulbs, from compan X, fnd the epected number havng a lfetme of less than 830 hours. (2) A rval compan Y sells bulbs wth a mean lfetme of 860 hours and 20% of these bulbs have a lfetme of less than 818 hours. (c) Fnd the standard devaton of the lfetmes of bulbs from compan Y. (4) Both companes sell the bulbs for the same prce. (d) State whch compan ou would recommend. Gve reasons for our answer. (2) 22 *H34279A02224*
15 phscsandmathstutor.com June 2009 Queston 8 contnued (Total 11 marks) TOTAL FOR PAPER: 75 MARKS END Q8 24 *H34279A02424*
16 phscsandmathstutor.com Januar The heghts of a populaton of women are normall dstrbuted wth mean μ cm and standard devaton cm. It s known that 30% of the women are taller than 172 cm and 5% are shorter than 154 cm. (a) Sketch a dagram to show the dstrbuton of heghts represented b ths nformaton. (b) Show that μ = (c) Obtan a second equaton and hence fnd the value of μ and the value of. (4) A woman s chosen at random from the populaton. (d) Fnd the probablt that she s taller than 160 cm. 20 *N35711A02024*
17 phscsandmathstutor.com Januar 2010 Queston 7 contnued Q7 (Total 13 marks) TOTAL FOR PAPER: 75 MARKS END 22 *N35711A02224*
18 phscsandmathstutor.com June The dstances travelled to work, D km, b the emploees at a large compan are normall dstrbuted wth D N( 30, 8 2 ). (a) Fnd the probablt that a randoml selected emploee has a journe to work of more than 20 km. (b) Fnd the upper quartle, Q 3, of D. (c) Wrte down the lower quartle, Q 1, of D. (1) An outler s defned as an value of D such that D< h or D> k where h= Q 1.5 ( Q Q ) and k = Q ( Q Q ) (d) Fnd the value of h and the value of k. (2) An emploee s selected at random. (e) Fnd the probablt that the dstance travelled to work b ths emploee s an outler. 24 *H35395A02428*
19 phscsandmathstutor.com June 2010 Queston 7 contnued Q7 (Total 12 marks) TOTAL FOR PAPER: 75 MARKS END *H35395A02728* 27
20 phscsandmathstutor.com Januar The weght, X grams, of soup put n a tn b machne A s normall dstrbuted wth a mean of 160 g and a standard devaton of 5 g. A tn s selected at random. (a) Fnd the probablt that ths tn contans more than 168 g. The weght stated on the tn s w grams. (b) Fnd w such that P(X w) = 0.01 The weght, Y grams, of soup put nto a carton b machne B s normall dstrbuted wth mean grams and standard devaton grams. (c) Gven that P(Y 160) = 0.99 and P(Y 152) = 0.90 fnd the value of and the value of. (6) 20 *H35410A02024*
21 phscsandmathstutor.com Januar 2011 Queston 8 contnued Q8 (Total 12 marks) TOTAL FOR PAPER: 75 MARKS END *H35410A02324* 23
22 phscsandmathstutor.com June Past records show that the tmes, n seconds, taken to run 100 m b chldren at a school can be modelled b a normal dstrbuton wth a mean of and a standard devaton of 1.60 A chld from the school s selected at random. (a) Fnd the probablt that ths chld runs 100 m n less than 15 s. On sports da the school awards certfcates to the fastest 30% of the chldren n the 100 m race. (b) Estmate, to 2 decmal places, the slowest tme taken to run 100 m for whch a chld wll be awarded a certfcate. (4) 8 *P38164A0824*
23 phscsandmathstutor.com Januar A manufacturer flls jars wth coffee. The weght of coffee, W grams, n a jar can be modelled b a normal dstrbuton wth mean 232 grams and standard devaton 5 grams. (a) Fnd P(W < 224). (b) Fnd the value of w such that P(232 < W < w) = 0.20 (4) Two jars of coffee are selected at random. (c) Fnd the probablt that onl one of the jars contans between 232 grams and w grams of coffee. 22 *P40699A02224*
24 phscsandmathstutor.com Januar 2012 Queston 7 contnued Q7 END (Total 10 marks) TOTAL FOR PAPER: 75 MARKS 24 *P40699A02424*
25 phscsandmathstutor.com June The heghts of an adult female populaton are normall dstrbuted wth mean 162 cm and standard devaton 7.5 cm. (a) Fnd the probablt that a randoml chosen adult female s taller than 150 cm. Sarah s a oung grl. She vsts her doctor and s told that she s at the 60th percentle for heght. (b) Assumng that Sarah remans at the 60th percentle, estmate her heght as an adult. The heghts of an adult male populaton are normall dstrbuted wth standard devaton 9.0 cm. Gven that 90% of adult males are taller than the mean heght of adult females, (c) fnd the mean heght of an adult male. (4) 18 *P40105XA01824*
26 phscsandmathstutor.com June 2012 Queston 6 contnued *P40105XA01924* 19 Turn over
27 phscsandmathstutor.com Januar The length of tme, L hours, that a phone wll work before t needs chargng s normall dstrbuted wth a mean of 100 hours and a standard devaton of 15 hours. (a) Fnd P(L > 127). (b) Fnd the value of d such that P(L < d) = 0.10 Alce s about to go on a 6 hour journe. Gven that t s 127 hours snce Alce last charged her phone, (c) fnd the probablt that her phone wll not need chargng before her journe s completed. (4) 8 *P41805A0820*
28 phscsandmathstutor.com Januar 2013 Queston 4 contnued Q4 (Total 10 marks) *P41805A0920* 9 Turn over
29 phscsandmathstutor.com June 2013 (R) 4. The tme, n mnutes, taken to fl from London to Malaga has a normal dstrbuton wth mean 150 mnutes and standard devaton 10 mnutes. (a) Fnd the probablt that the net flght from London to Malaga takes less than 145 mnutes. The tme taken to fl from London to Berln has a normal dstrbuton wth mean 100 mnutes and standard devaton d mnutes. Gven that 15% of the flghts from London to Berln take longer than 115 mnutes, (b) fnd the value of the standard devaton d. (4) The tme, X mnutes, taken to fl from London to another ct has a normal dstrbuton wth mean µ mnutes. Gven that P(X < µ 15) = 0.35 (c) fnd P(X > µ + 15 X > µ 15). 10 *P43956A01024*
30 phscsandmathstutor.com June 2013 (R) Queston 4 contnued *P43956A01124* 11 Turn over
31 phscsandmathstutor.com June The weght, n grams, of beans n a tn s normall dstrbuted wth mean and standard devaton 7.8 Gven that 10% of tns contan less than 200 g, fnd (a) the value of (b) the percentage of tns that contan more than 225 g of beans. The machne settngs are adjusted so that the weght, n grams, of beans n a tn s normall dstrbuted wth mean 205 and standard devaton. (c) Gven that 98% of tns contan between 200 g and 210 g fnd the value of. (4) 22 *P42831A02224*
32 phscsandmathstutor.com June 2013 Queston 6 contnued Q6 (Total 10 marks) END TOTAL FOR PAPER: 75 MARKS 24 *P42831A02424*
33 Statstcs S1 Probablt P( A B ) = P( A ) + P( B ) P( A B ) P( A B ) = P( A ) P( B A ) P( B A ) P( A ) P( A B ) = P( B A ) P( A ) + P( B A ) P( A ) Dscrete dstrbutons For a dscrete random varable X takng values wth probabltes P(X = ) Epectaton (mean): E(X) = µ = P(X = ) Varance: Var(X) = σ 2 = ( µ ) 2 P(X = ) = 2 P(X = ) µ 2 For a functon g(x ) : E(g(X)) = g( ) P(X = ) Contnuous dstrbutons Standard contnuous dstrbuton: Dstrbuton of X P.D.F. Mean Varance Normal N( µ, σ ) µ 1 2 σ e σ 2π µ 2 σ 16 Edecel AS/A level Mathematcs Formulae Lst: Statstcs S1 Issue 1 September 2009
34 Edecel AS/A level Mathematcs Formulae Lst: Statstcs S1 Issue 1 September Correlaton and regresson For a set of n pars of values ), ( n S ) ( ) ( = = n S ) ( ) ( = = n S ) )( ( ) )( ( = = The product moment correlaton coeffcent s = = = n n n S S S r ) ( ) ( ) )( ( ) ( ) ( ) )( ( } }{ { The regresson coeffcent of on s 2 ) ( ) )( ( S S b = = Least squares regresson lne of on s b a + = where b a =
35 THE NORMAL DISTRIBUTION FUNCTION The functon tabulated below s Φ(z), defned as Φ(z) = z t 2 2π e dt. z Φ(z) z Φ(z) z Φ(z) z Φ(z) z Φ(z) Edecel AS/A level Mathematcs Formulae Lst: Statstcs S1 Issue 1 September 2009
36 PERCENTAGE POINTS OF THE NORMAL DISTRIBUTION The values z n the table are those whch a random varable Z N(0, 1) eceeds wth probablt p; that s, P(Z > z) = 1 Φ(z) = p. p z p z Edecel AS/A level Mathematcs Formulae Lst: Statstcs S1 Issue 1 September
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